Black Rock Mining produces 99% graphite in recent pilot plant test

Junior graphite producer Black Rock Mining is hopeful it can deliver 99% pure graphite at scale after reporting successful test results from pilot plant test work.

The ASX-listed firm was able to produce 99% plus graphite concentrate using only flotation methods during a recent pilot plant test at SGS Lakefield in Canada.

SGS undertook the pilot plant test work using 90 tonnes of ore sourced from Black Rock’s Mahenge Graphite Project, based in Tanzania.

Mahenge is currently the fourth largest graphite resource in the world, with a mineral resource estimate of 211.9 million tonnes (Mt) at 7.8% total graphitic carbon for 16.6 Mt of contained graphite.

“We are not aware of any deposit that is capable of producing 99.3% grade concentrate by standard flotation alone,” said Black Rock’s CEO John de Vries.

“Being able to generate ultra high-grade product using flotation is of significant value to downstream processors who are increasingly finding environmental constraints impacting their business.

“We are particularly pleased with the minimal flake degradation during the additional polishing,” he continued. “With over 55% of the ultra grade concentrate reporting to the large and jumbo fraction, this simply underlines how remarkable Mahenge flake really is.”